“…Despite PDE3 being present in T lymphocytes, it has a limited impact on T-cell proliferation and cytokine production (Giembycz, Corrigan, Seybold, Newton, & Barnes, 1996). gesting that PDE3 may act as a novel anti-inflammatory target in allergic airway inflammation (Beute et al, 2018). Regarding bronchodilation, a substantial body of evidence shows that PDE3 inhibitors (siguazodan, SK&F94120, and org9935) are potent relaxants in airway smooth muscle (Bernareggi, Belvisi, Patel, Barnes, & Giembycz, 1999;Nicholson et al, 1995;Torphy et al, 1993), while contrasting findings are reported regarding PDE4 inhibition in various animal models.…”